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If you are looking for an excellent overview of general architecture principles then take a look at Will Larson's Introduction to Architecting Systems for Scale. Based on his experiences at Yahoo! and Digg, Will covers key concepts in some depth. A quick gloss on the building blocks:
- Load Balancing: Scalability & Redundancy. Horizontal scalability and redundancy are usually achieved via load balancing, the spreading of requests across multiple resources.
- Smart Clients. The client has a list of hosts and load balances across that list of hosts. Upside is simple for programmers. Downside is it's hard to update and change.
- Hardware Load Balancers. Targeted at larger companies, this is dedicated load balancing hardware. Upside is performance. Downside is cost and complexity.
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